SDN and NFV is the next phase of technology change which will help service provider to launch the services in single click. This is all about the programmability of the networks by using open source software defined network controller.

To get rid from the above issues, we can use Rectified Linear Unit Activation Function which is also known as RELU. RELU function has range between 0 and Infinity. Hence Sigmoid Activation function can be used to predict the values between 0 and 1 whereas can be used to model real positive number. The best of RELU is that whenever we increase the input values of X, the gradient also changes.
RELU can be defined with the simple below mentioned Mathematical notation:
RELU(x) = MAX (0, x)
The functions says if the input value is 0 or less than 0, RELU will return 0 else it will return the input value of x.
Below is the image of Sigmoid Curve: